Until now, Facebook's top investors were technology giant Microsoft and Digital Sky Technologies. Digital Sky is a Russian investment firm owned by Alisher Burkhanovich Usmanov, one Russia's richest men. But there are others who have banked on Facebook's success and hold a stake in the company's future.

Unlike the open, tell-it-to-the-world philosophy Facebook encourages of its user "friends," Facebook is a private company that keeps its finances and financiers under wraps. So here's a list of Facebook's known stakeholders -- those that the company has confirmed or have been reported through major media outlets:

Mark Zuckerberg, Facebook founder and CEO.

Dustin Moskovitz, Facebook co-founder and former employee.

Eduardo Saverin, Facebook co-founder and former employee.

Chris Hughes, Facebook co-founder and former employee.

Goldman Sachs. This major investment bank made a $450 million investment in January 2011, according to the New York Times.

Digital Sky Technologies. This Russian investment firm made a $200 million investment in May 2009 for preferred stock at a $10 billion valuation, according to Facebook. It invested another $50 million in January 2011, according to the New York Times.

Peter Andreas Thiel, an American entrepreneur, hedge fund manager and venture capitalist, who co-founded PayPal and was its CEO. Thiel was an early investor in Facebook, contributing more than $500,000, according to Facebook. He currently sits on the company's board of directors.

Sir Ka-shing Li, a wealthy businessman from Hong Kong and one of the richest persons in the world. Li invested an estimated $120 million through the Li Ka Shing Foundation, according to a Reuters report.

Matt Cohler, an American entrepreneur and venture capitalist and former Facebook employee.